object {
  nullable = null
  property = "value"
}

mapping {
  ["nullable"] = null
  ["key"] = "value"
}

map = Map("nullable", null, "key", "value")

output {
  renderer = new PropertiesRenderer {
    omitNullProperties = true
    converters {
      ["object.property"] = (it) -> "converted"
      ["mapping[key]"] = (it) -> "converted"
      ["map[key]"] = (it) -> "converted"
    }
  }
}